But we can say with some confidence that the attacks are getting Americans' attention. Via Politico's Alex Burns, here's a chart that shows that Google searches for "Bain Capital" have increased exponentially since late last week, when reports about Romney's confusing involvement -- or non-involvement -- with the firm from 1999 to 2002 started to surface. The numbers along the y-axis are Google's search volume index, basically an arbitrary number that measures recent searches relative to past ones. It's the rapid growth that should be scary for the Romney campaign -- it means that voters are taking notice of the controversy, and makes it harder to change the subject to something less favorable to Obama.

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The list of locations with the greatest interest has some red flags, too: